My DD will be almost 1 and my son will be 2.75 years. Do I do a double? I read someone discourage that. Do I do 2 singles? If 2 singles, both umbrella? One umbrella, one bigger for the storage underneath? I'm fairly tall (5'11") and never pushed an umbrella stroller for hours. I also babywear, and likely my daughter will be on my or my husband's back for a significant portion of the trip, so actually considering maybe just one stroller...